package dptest;


public class t70 {

	public static void main(String[] args) {
		int n = 3;
		/*if(n == 1) {
			return 1;
		}else if(n == 2) {
			return 2;
		}*/
		int dp [] = new int [n+1];
		dp[0] = 1;
		dp[1] = 1;
		dp[2] = 2;
		for(int i = 3; i<=n; i++) {
			dp[i] = dp[i-1] + dp[i-2];
		}
		System.out.println(dp[n]);
		//return dp[n];

	}

}
